US7406478B2 - Flexible handling of datetime XML datatype in a database system - Google Patents
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- US7406478B2 US7406478B2 US11/202,463 US20246305A US7406478B2 US 7406478 B2 US7406478 B2 US 7406478B2 US 20246305 A US20246305 A US 20246305A US 7406478 B2 US7406478 B2 US 7406478B2
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F16/00—Information retrieval; Database structures therefor; File system structures therefor
- G06F16/80—Information retrieval; Database structures therefor; File system structures therefor of semi-structured data, e.g. markup language structured data such as SGML, XML or HTML
- G06F16/84—Mapping; Conversion
- G06F16/86—Mapping to a database
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S707/00—Data processing: database and file management or data structures
- Y10S707/99941—Database schema or data structure
- Y10S707/99942—Manipulating data structure, e.g. compression, compaction, compilation
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y10S707/99943—Generating database or data structure, e.g. via user interface
Definitions
- the present invention relates to representing XML data in a database, and in particular, to representing XML data types related to date and/or times.
- the Extensible Markup Language is the standard for data and documents that is finding wide acceptance in the computer industry. XML describes and provides structure to a body of data, such as a file or data packet. The XML standard provides for tags that delimit sections of XML documents referred to as XML elements.
- XML schemas Information about the structure of specific types of XML documents may be specified in documents referred to as “XML schemas”.
- the XML schema for a particular type of XML document may specify the names for the elements contained in that type of XML document, the hierarchical relationship between the elements contained in that type of XML document, and the type of values contained in that particular type of XML document.
- Standards governing XML schemas include XML Schema, Part 0, Part 1, Part 2, W3C Recommendation, 2 May 2001, the contents of which are incorporated herein by reference, XML Schema Part 1: Structures, Second Edition, W3C Recommendation 28 October. 2004, the contents of which are incorporated herein by reference, and XML Schema Part 2: Datatypes Second Edition, W3C Recommendation 28 October 28, 2004, the contents of which incorporated herein by reference.
- One type of storage mechanism stores an XML document as a text file in a file system.
- Another type of storage mechanism uses object-relational database systems that are enhanced to store and process queries for collections of XML documents. Furthermore, these object-relational database systems can store and manage XML documents as instances of XML schemas. To store and manage the XML documents in a database system, database representations, defined in terms of database data types handled by the database system, are used to represent XML documents.
- a database representation of an entire XML document may be a CLOB (binary large object), or maybe one or more tables whose columns store the components of an XML document in one or more rows.
- a database representation may be a hierarchy of objects in an object-relational database; each object is an instance of an object class and stores one or more elements of an XML document.
- the object class defines, for example, the structure corresponding to an element, and includes references or pointers to objects representing the immediate descendants of the element.
- XML standards define data types, referred to herein as XML data types. Among these data types are primitive data types for representing dates and/or times, referred to herein as XML date-time types. Examples of XML date-time types include the XML primitive data types “dateTime”, “date”, “time”, and “gYearMonth”. XML standards are very flexible and permit instance values to have optional properties. For example, XML standards permit the ‘dateTime’ type instance to have an arbitrary level of precision, or to have a time Zone property, i.e. to be “with time-zone”.
- database types such as American National Standards Institute (“ANSI”) SQL types DATE, TIMESTAMP, and TIMESTAMP WITH TIMEZONE are used as a database representation of an XML date-time type.
- ANSI American National Standards Institute
- Database types for date and/or time values are referred to herein database date-time types.
- the present invention is not limited to any data type of any particular standard for database languages.
- TIMESTAMP(5) declares a timestamp with a level of precision of 5 (i.e. seconds to five decimal places).
- Database date-time types are used for database representations of XML date-time types.
- a database date-time type as a database representation of a XML date-time type
- a decision is made as to what extent the full range of options of the XML date-time type is to be supported by a database date-time type.
- the decision needs to strike a balance between supporting a wider range of options and using more database system resources to support the range of options.
- the time zone property of the XML dateTime type may be supported by the TIMESTAMP WITH TIME ZONE database type.
- this database type requires more storage space than other alternatives, such as TIMESTAMP.
- XML documents stored in a database system do not include dataTime instances with time zone, then database system resources are wasted to support a feature that is not ever used. Similarly, a level of precision of 5 can be supported by using a database type of TIMESTAMP(5). However, many dataTime instances in XML documents stored in a database system may not have this level of precision.
- XML date-time types are by default represented by a general all-purpose database representation that can handle a wide range of user requirements, but not necessarily all of the user requirements. As a result, either resources are wasted to support a range of options that are seldom if ever used, or user requirements for XML date-time types are not supported in some situations.
- FIG. 1 is a block diagram of a storage mechanism for storing XML data according to an embodiment of the present invention.
- FIG. 2 is a block diagram of a computer system according to an embodiment of the present invention.
- a database server determines (1) a database representation for the XML schema and (2) mapping information.
- the database representation determination is a determination about what database-types should be used to represent an XML schema and/or how instances of the XML schema are stored by a database system. Determining the appropriate database representation for a given XML schema may involve, for example, determining the database types, database objects, collection types, constraints, and even the indexes that are to be used by a database system to store data for XML documents that conform to the given XML schema.
- the mapping information indicates the mapping between the constructs declared in the XML schema and the constructs included in the appropriate database representation.
- an XML schema may contain annotations (“date-time annotations”) that describe one or more properties of a database representation of an XML date-time type. Based on the annotations, the database determines an appropriate database representation and generates mapping information mapping the declaration of the XML date-time type of the XML schema to the constructs of the database representation.
- FIG. 1 is a block diagram of a system that includes a mechanism for mapping XML schemas to object-relational database systems.
- the system includes a database server 104 .
- a server such as database server 104 , is a combination of integrated software components and an allocation of computational resources, such as memory, one or more computers, and processes on the one or more computers that execute the integrated software components on a processor, the combination of the software and computational resources being dedicated to performing a particular function on behalf of one or more clients.
- a database server governs and facilitates access to a particular database, processing requests by clients to access the database.
- Database server 104 includes an XML schema mapper 106 .
- XML schema mapper 106 determines the appropriate database representation 108 for documents that conform to XML schema 102 , and generates mapping information 110 that indicates the correlation between the constructs declared by the XML schema and the elements of the database representation 108 .
- an XML schema has to be first registered with database server 104 before it can be used or referenced within database server 104 . After the registration process is completed, XML documents conforming to this schema (and referencing it via the schema URL within the document) can be stored and treated by database server 104 as instances of the XML schema.
- mapping information is generated to indicate the correlation between the parts of the database representation and the elements identified in the particular XML schema.
- the mapping information may indicate, for example, that data associated with a specific element of the XML schema should be stored in a particular column of a table that is generated as part of the appropriate database representation.
- mapping information enables performance benefits. For example, query performance may be improved by rewriting XPath queries to directly access the underlying columns. In addition, update performance may be improved by rewriting updates to directly update the underlying columns. Consequently, updating a portion of the XML data from a stored document would not always require rewriting the entire XML data for the stored document.
- date-time annotations are in the form of “annotation attributes” included in the elements of a XML schema.
- the attributes may belong to a namespace, such as XDB.
- the annotation attributes specify the database type of a database representation of an XML date-time attribute, and can specify one or more properties of the database type, such as a level of precision and with time-zone.
- the following declaration is provided as an illustration.
- the preceding declaration is an element in an XML schema and defines an element of the type XML dateTime with a name of ‘dob’.
- the annotation attribute ‘xdb:SQLType’ specifies a database date-time type of TIMESTAMP with a level of precision of 5 decimal places for seconds.
- database server 104 When database server 104 registers the schema, database server 104 creates the object type PERSON_T with the following attributes:
- database server 104 uses TIMESTAMP (without time-zone) as the default database representation, causing time zone information to be ignored.
- database server 104 can store and treat XML documents as instances of the XML schema, such as the following XML document.
- the precision of the database representation can be varied between multiple declarations within a XML schema, as illustrated in the following XML schema.
- database server 104 can store and treat XML documents as instances of the XML schema, such as the following XML document.
- FIG. 2 is a block diagram that illustrates a computer system 200 upon which an embodiment of the invention may be implemented.
- Computer system 200 includes a bus 202 or other communication mechanism for communicating information, and a processor 204 coupled with bus 202 for processing information.
- Computer system 200 also includes a main memory 206 , such as a random access memory (RAM) or other dynamic storage device, coupled to bus 202 for storing information and instructions to be executed by processor 204 .
- Main memory 206 also may be used for storing temporary variables or other intermediate information during execution of instructions to be executed by processor 204 .
- Computer system 200 further includes a read only memory (ROM) 208 or other static storage device coupled to bus 202 for storing static information and instructions for processor 204 .
- a storage device 210 such as a magnetic disk or optical disk, is provided and coupled to bus 202 for storing information and instructions.
- Computer system 200 may be coupled via bus 202 to a display 212 , such as a cathode ray tube (CRT), for displaying information to a computer user.
- a display 212 such as a cathode ray tube (CRT)
- An input device 214 is coupled to bus 202 for communicating information and command selections to processor 204 .
- cursor control 216 is Another type of user input device
- cursor control 216 such as a mouse, a trackball, or cursor direction keys for communicating direction information and command selections to processor 204 and for controlling cursor movement on display 212 .
- This input device typically has two degrees of freedom in two axes, a first axis (e.g., x) and a second axis (e.g., y), that allows the device to specify positions in a plane.
- the invention is related to the use of computer system 200 for implementing the techniques described herein. According to one embodiment of the invention, those techniques are performed by computer system 200 in response to processor 204 executing one or more sequences of one or more instructions contained in main memory 206 . Such instructions may be read into main memory 206 from another machine-readable medium, such as storage device 210 . Execution of the sequences of instructions contained in main memory 206 causes processor 204 to perform the process steps described herein. In alternative embodiments, hard-wired circuitry may be used in place of or in combination with software instructions to implement the invention. Thus, embodiments of the invention are not limited to any specific combination of hardware circuitry and software.
- machine-readable medium refers to any medium that participates in providing data that causes a machine to operation in a specific fashion.
- various machine-readable media are involved, for example, in providing instructions to processor 204 for execution.
- Such a medium may take many forms, including but not limited to, non-volatile media, volatile media, and transmission media.
- Non-volatile media includes, for example, optical or magnetic disks, such as storage device 210 .
- Volatile media includes dynamic memory, such as main memory 206 .
- Transmission media includes coaxial cables, copper wire and fiber optics, including the wires that comprise bus 202 . Transmission media can also take the form of acoustic or light waves, such as those generated during radio-wave and infra-red data communications.
- Machine-readable media include, for example, a floppy disk, a flexible disk, hard disk, magnetic tape, or any other magnetic medium, a CD-ROM, any other optical medium, punchcards, papertape, any other physical medium with patterns of holes, a RAM, a PROM, and EPROM, a FLASH-EPROM, any other memory chip or cartridge, a carrier wave as described hereinafter, or any other medium from which a computer can read.
- Various forms of machine-readable media may be involved in carrying one or more sequences of one or more instructions to processor 204 for execution.
- the instructions may initially be carried on a magnetic disk of a remote computer.
- the remote computer can load the instructions into its dynamic memory and send the instructions over a telephone line using a modem.
- a modem local to computer system 200 can receive the data on the telephone line and use an infra-red transmitter to convert the data to an infra-red signal.
- An infra-red detector can receive the data carried in the infra-red signal and appropriate circuitry can place the data on bus 202 .
- Bus 202 carries the data to main memory 206 , from which processor 204 retrieves and executes the instructions.
- the instructions received by main memory 206 may optionally be stored on storage device 210 either before or after execution by processor 204 .
- Computer system 200 also includes a communication interface 218 coupled to bus 202 .
- Communication interface 218 provides a two-way data communication coupling to a network link 220 that is connected to a local network 222 .
- communication interface 218 may be an integrated services digital network (ISDN) card or a modem to provide a data communication connection to a corresponding type of telephone-line.
- ISDN integrated services digital network
- communication interface 218 may be a local area network (LAN) card to provide a data communication connection to a compatible LAN.
- LAN local area network
- Wireless links may also be implemented.
- communication interface 218 sends and receives electrical, electromagnetic or optical signals that carry digital data streams representing various types of information.
- Network link 220 typically provides data communication through one or more networks to other data devices.
- network link 220 may provide a connection through local network 222 to a host computer 224 or to data equipment operated by an Internet Service Provider (ISP) 226 .
- ISP 226 in turn provides data communication services through the world wide packet data communication network now commonly referred to as the “Internet” 228 .
- Internet 228 uses electrical, electromagnetic or optical signals that carry digital data streams.
- the signals through the various networks and the signals on network link 220 and through communication interface 218 which carry the digital data to and from computer system 200 , are exemplary forms of carrier waves transporting the information.
- Computer system 200 can send messages and receive data, including program code, through the network(s), network link 220 and communication interface 218 .
- a server 230 might transmit a requested code for an application program through Internet 228 , ISP 226 , local network 222 and communication interface 218 .
- the received code may be executed by processor 204 as it is received, and/or stored in storage device 210 , or other non-volatile storage for later execution. In this manner, computer system 200 may obtain application code in the form of a carrier wave.
Abstract
Description
<element name=“dob” type=“dateTime” |
xdb:SQLType=“TIMESTAMP(5) WITH TIME ZONE”/> | ||
<schema xmlns=“http://www.w3.org/2001/XMLSchema” |
xmlns:xdb=“http://xmlns.oracle.com/xdb” | |
targetNamespace=“my” xmlns:my=“my” | |
elementFormDefault=“qualified”> |
<element name=“Person” xdb:SQLType=“PERSON_T” |
xdb:defaultTable=“PERSON_TAB”> |
<complexType> |
<sequence> |
<element name=“name” type=“string”/> | |
<element name=“dob” type=“dateTime” |
xdb:SQLType=“TIMESTAMP WITH | |
TIME ZONE”/> |
</sequence> |
</complexType> |
</element> |
</schema> |
Name | Database Type | ||
name | VARCHAR2(4000 CHAR) | ||
dob | TIMESTAMP(6) WITH TIME ZONE | ||
-
- Once the XML schema is registered,
database server 104 can store and treat XML documents as instances of the XML schema, such as the following XML document.
- Once the XML schema is registered,
<Person xmlns=“my” | ||
xmlns:xsi=“http://www.w3.org/2001/XMLSchema-instance” |
xsi:schemaLocation=“my sch1.xsd”> |
<name>foo</name> | |
<dob>1973-02-12T13:44:32.342566+03:00</dob> |
</Person> | ||
<schema xmlns=“http://www.w3.org/2001/XMLSchema” |
xmlns:xdb=“http://xmlns.oracle.com/xdb” | |
targetNamespace=“my” xmlns:my=“my” | |
elementFormDefault=“qualified”> |
<element name=“Root” xdb:SQLType=“ROOT_T” | |
xdb:defaultTable=“ROOT_TAB”> | |
<complexType> |
<sequence> | |
<element name=“dt1” type=“dateTime” |
xdb:SQLType=“TIMESTAMP WITH TIME ZONE”/> |
<element name=“t1” type=“time” |
xdb:SQLType=“TIMESTAMP WITH TIME ZONE”/> |
<element name=“d1” type=“date” |
xdb:SQLType=“TIMESTAMP WITH TIME ZONE”/> |
<element name=“gy1” type=“gYear” |
xdb:SQLType=“TIMESTAMP WITH TIME ZONE”/> |
<element name=“gm1” type=“gMonth” |
xdb:SQLType=“TIMESTAMP WITH TIME ZONE”/> |
<element name=“gd1” type=“gDay” |
xdb:SQLType=“TIMESTAMP WITH TIME ZONE”/> |
<element name=“gym1” type=“gYearMonth” |
xdb:SQLType=“TIMESTAMP WITH TIME ZONE”/> |
<element name=“gmd1” type=“gMonthDay” |
xdb:SQLType=“TIMESTAMP WITH TIME ZONE”/> |
</sequence> |
</complexType> | ||
</element> | ||
</schema> | ||
<Root xmlns=“my” | ||
xmlns:xsi=“http://www.w3.org/2001/XMLSchema-instance” |
xsi:schemaLocation=“my sch2.xsd”> |
<dt1>1973-02-12T13:44:32Z</dt1> | |
<t1>13:44:32Z</t1> | |
<d1>1973-02-12Z</d1> | |
<gy1>1973-02:00</gy1> | |
<gm1>--05--Z</gm1> | |
<gd1>---11Z</gd1> | |
<gym1>1973-02Z</gym1> | |
<gmd1>--02-12Z</gmd1> |
</Root> | ||
<schema xmlns=“http://www.w3.org/2001/XMLSchema” |
xmlns:xdb=“http://xmlns.oracle.com/xdb” | |
targetNamespace=“my” xmlns:my=“my” elementFormDefault=“qualified”> |
<element name=“Root5” xdb:SQLType=“ROOT5_T” defaultTable=“ROOT5_TAB”> |
<complexType> |
<sequence> | |
<element name=“dt1” type=“dateTime”/> | |
<element name=“dt2” type=“dateTime” xdb:SQLType=“TIMESTAMP(0)”/> | |
<element name=“dt3” type=“dateTime” xdb:SQLType=“TIMESTAMP(5)”/> | |
<element name=“dt4” type=“dateTime” xdb:SQLType=“TIMESTAMP(9)”/> | |
<element name=“dt5” type=“dateTime” xdb:SQLType=“TIMESTAMP(0) WITH TIME |
ZONE”/> |
<element name=“dt6” type=“dateTime” xdb:SQLType=“TIMESTAMP(5) WITH TIME |
ZONE”/> |
<element name=“dt7” type=“dateTime” xdb:SQLType=“TIMESTAMP(9) WITH TIME |
ZONE”/> |
</sequence> |
</complexType> |
</element> |
</schema> |
<Root5 xmlns=“my” | ||
xmlns:xsi=“http://www.w3.org/2001/XMLSchema-instance” |
xsi:schemaLocation=“my sch5.xsd”> |
<dt1>1973-02-12T13:44:32.666666666</dt1> | ||
<dt2>1973-02-12T13:44:32</dt2> | ||
<dt3>1973-02-12T13:44:32.666666666</dt3> | ||
<dt4>1973-02-12T13:44:32.666666666</dt4> | ||
<dt5>1973-02-12T13:44:32.6+04:00</dt5> | ||
<dt6>1973-02-12T13:44:32.666666666+04:00</dt6> | ||
<dt7>1973-02-12T13:44:32.666666666+04:00</dt7> | ||
</Root5> | ||
Hardware Overview
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US20070038649A1 US20070038649A1 (en) | 2007-02-15 |
US7406478B2 true US7406478B2 (en) | 2008-07-29 |
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